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first install wifi drivers for your motherboard with the latest versionthen see if your router is configured properly as your ISP did initiallyif all these are ok then connect there should not be any problem

Have you change settings on your router? if not try to disconnect and reconnect your dell computer. if still not working. turn off both laptop, turn off the router and modem. wait for 10-20 seconds then turn on the modem first, and if the modem is stable, turn on the router, and if it is stable, turn on the dell computer and try to connect. If still fails, try to delete wireless profile adn recreate it. If still fails, check device manger if there is a problem in your wireless driver. If still cannot connect, perform system restore.

There is no switch on an Inspiron 2200. I would go to Dell's website and download the drivers for your model # and then uninstall the existing adapter. then try installing the new driver and let me know what happens.

So u can connect to the router, but you arent allowet to access the internet?
The router gave your dell a new ip-number, but it dident gave you access to the net. You ned to do the settings in your router manual, let the router give your dell full access.